/*
Rounded Corners for jQuery
v0.1 - July 22, 2008

Copyright (c) David Turnbull, Steven Wittens

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/


jQuery.fn.corners = function(options) {
  var settings = parseOptions(options);
  var webkitAvailable = false;
  try {
    webkitAvailable = (document.defaultView.getComputedStyle(this[0], null)['-webkit-border-radius'] != undefined);
  } catch(err) {}
  return this.each(function(){
    //TODO prevent rounding more than once
    var class_scan = /{(.*)}/.exec(this.className)
    var s = class_scan ? parseOptions(class_scan[1], settings) : settings
    if (webkitAvailable && s.webkit) roundWebkit(this, s);
    else {
      var bgColor = backgroundColor(this.parentNode);
      var fgColor = backgroundColor(this);
      switch (this.nodeName.toLowerCase()) {
        case 'a':
          roundLink(this, s, bgColor, fgColor);
          break;
        case 'input':
          roundInput(this, s, bgColor, fgColor);
          break;
        default:
          roundDiv(this, s, bgColor, fgColor);
          break;
      }
    }
  });
  
  function roundWebkit(e, s) {
    var radius = '' + s.sizex + 'px ' + s.sizey + 'px';
    if (s.tl) jQuery(e).css('WebkitBorderTopLeftRadius', radius);
    if (s.tr) jQuery(e).css('WebkitBorderTopRightRadius', radius);
    if (s.bl) jQuery(e).css('WebkitBorderBottomLeftRadius', radius);
    if (s.br) jQuery(e).css('WebkitBorderBottomRightRadius', radius);
  }
  
  function roundLink(e, s, bgColor, fgColor) {
    var table = tableElement("table");
    var tbody = tableElement("tbody");
    table.appendChild(tbody);
    var tr1 = tableElement("tr");
    var td1 = tableElement("td");
    tr1.appendChild(td1);
    var tr2 = tableElement("tr");
    var td2 = relocateContent(e, s, tableElement("td"));
    tr2.appendChild(td2);
    var tr3 = tableElement("tr");
    var td3 = tableElement("td");
    tr3.appendChild(td3);
    if (s.tl||s.tr) {
      tbody.appendChild(tr1);
      addCorners(td1, s, bgColor, fgColor, true)
    }
    tbody.appendChild(tr2);
    if (s.bl||s.br) {
      tbody.appendChild(tr3);
      addCorners(td3, s, bgColor, fgColor, false)
    }
    e.appendChild(table);
    /* Clicking on {a>table} in IE will trigger onclick but not the href  */
    if (jQuery.browser.msie) table.onclick = ieLinkBypass;
    /* Firefox 2 will render garbage unless we hide the overflow here */
    e.style.overflow = 'hidden';
  }
  
  function ieLinkBypass() {
    if (!this.parentNode.onclick) this.parentNode.click();
  }
  
  function roundInput(e, s, bgColor, fgColor) {
    //TODO test image buttons should be translatable
    //TODO possibly emulate value and disabled attributes??
    var a1 = document.createElement("a");
    a1.href = LazyCorners._parentForm(e).action
    a1.id = e.id;
    a1.className = e.className;
    if (e.onclick) a1.onclick = e.onclick;
    else a1.onclick = submitForm;
    var a2 = document.createTextNode(e.value);
    a1.appendChild(a2);
    e.parentNode.replaceChild(a1, e);
    roundLink(a1, s, bgColor, fgColor);
  }
  
  function submitForm() {
    parentForm(this).submit();
    return false;
  }

  function parentForm(e) {
    if (e.nodeName.toLowerCase() == 'form') return e
    return parentForm(e.parentNode);
  }

  function roundDiv(e, s, bgColor, fgColor) {
    var div = relocateContent(e, s, document.createElement('div'));
    e.appendChild(div);
    if (s.tl||s.tr) addCorners(e, s, bgColor, fgColor, true);
    if (s.bl||s.br) addCorners(e, s, bgColor, fgColor, false);
  }
  
  function relocateContent(e, s, d) {
    var $e = jQuery(e);
    var c;
    while(c=e.firstChild) d.appendChild(c);
    if (e.style.height) {
      var h = parseInt($e.css('height'))
      d.style.height = h + 'px';
      h += parseInt($e.css('padding-top')) + parseInt($e.css('padding-bottom'))
      e.style.height = h + 'px';
    }
    if (e.style.width) {
      var w = parseInt($e.css('width'))
      d.style.width = w + 'px';
      w += parseInt($e.css('padding-left')) + parseInt($e.css('padding-right'))
      e.style.width = w + 'px';
    }
    d.style.paddingLeft = $e.css('padding-left');
    d.style.paddingRight = $e.css('padding-right');
    if (s.tl||s.tr) {
      d.style.paddingTop = adjustedPadding(e, s, $e.css('padding-top'), true);
    } else {
      d.style.paddingTop = $e.css('padding-top');
    }
    if (s.bl||s.br) {
      d.style.paddingBottom = adjustedPadding(e, s, $e.css('padding-bottom'), false);
    } else {
      d.style.paddingBottom = $e.css('padding-bottom');
    }
    e.style.padding = 0;
    return d;
  }
  
  function adjustedPadding(e, s, pad, top) {
    if (pad.indexOf("px") < 0) {
      try {
        alert(pad);
        console.error('%s padding not in pixels', (top ? 'top' : 'bottom'), e);
      }
      catch(err) {}
      pad = s.sizey + 'px'
    }
    pad = parseInt(pad);
    if (pad - s.sizey < 0) {
      try {
        console.error('%s padding is %ipx for %ipx corner:', (top ? 'top' : 'bottom'), pad, s.sizey, e);
      }
      catch(err) {}
      pad = s.sizey;
    }
    return pad - s.sizey + 'px';
  }

  function tableElement(kind) {
    var e = document.createElement(kind)
    e.style.border = 'none';
    e.style.borderCollapse = 'collapse';
    e.style.borderSpacing = 0;
    e.style.padding = 0;
    e.style.margin = 0;
    return e;
  }
  
  function backgroundColor(e) {
    try {
      var c = jQuery.css(e, "background-color");
      if ( c.match(/^(transparent|rgba\(0,\s*0,\s*0,\s*0\))$/i) && e.parentNode )
         return backgroundColor(e.parentNode);
      if (c==null)
        return "#ffffff";
      if (c.indexOf("rgb") > -1)
    	  c = rgb2hex(c);
      if (c.length == 4)
  	    c = hexShort2hex(c);
      return c;
    } catch(err) {
      return "#ffffff";
    }
  }
  
  function hexShort2hex(c) {
    return '#' +
    c.substring(1,2) +
    c.substring(1,2) +
    c.substring(2,3) +
    c.substring(2,3) +
    c.substring(3,4) +
    c.substring(3,4);
  }

  function rgb2hex(c) {
  	var x = 255;
  	var hex = '';
  	var i;
  	var regexp=/([0-9]+)[, ]+([0-9]+)[, ]+([0-9]+)/;
  	var array=regexp.exec(c);
  	for(i=1;i<4;i++) hex += ('0'+parseInt(array[i]).toString(16)).slice(-2);
  	return '#'+hex;
  }
  
  function parseOptions(options, settings) {
    var options = options || '';
    var s = {sizex:4, sizey:4, tl: false, tr: false, bl: false, br: false, webkit:true, transparent:false};
    if (settings) {
      s.sizex = settings.sizex;
      s.sizey = settings.sizey;
      s.webkit = settings.webkit;
      s.transparent = settings.transparent;
    }
    var sizex_set = false;
    var corner_set = false;
    jQuery.each(options.split(' '), function(idx, option) {
      option = option.toLowerCase();
      var i = parseInt(option);
      if (i > 0 && option == i + 'px') {
        s.sizey = i;
        if (!sizex_set) s.sizex = i;
        sizex_set = true;
      } else {
        if (option == 'webkit') s.webkit = true;
        if (option == 'nowebkit') s.webkit = false;
        if (option == 'transparent') s.transparent = true;
        if (option == 'anti-alias') s.transparent = false;
        if (option == 'top') corner_set = s.tl = s.tr = true;
        if (option == 'right') corner_set = s.tr = s.br = true;
        if (option == 'bottom') corner_set = s.bl = s.br = true;
        if (option == 'left') corner_set = s.tl = s.bl = true;
        if (option == 'top-left') corner_set = s.tl = true;
        if (option == 'top-right') corner_set = s.tr = true;
        if (option == 'bottom-left') corner_set = s.bl = true;
        if (option == 'bottom-right') corner_set = s.br = true;
      }
    });
    if (!corner_set) {
      if (!settings) {
        s.tl = s.tr = s.bl = s.br = true;
      } else {
        s.tl = settings.tl;
        s.tr = settings.tr;
        s.bl = settings.bl;
        s.br = settings.br;
      }
    }
    return s;
  }
  
  function alphaBlend(a, b, alpha) {
    var ca = Array(
      parseInt('0x' + a.substring(1, 3)),
      parseInt('0x' + a.substring(3, 5)),
      parseInt('0x' + a.substring(5, 7))
    );
    var cb = Array(
      parseInt('0x' + b.substring(1, 3)),
      parseInt('0x' + b.substring(3, 5)),
      parseInt('0x' + b.substring(5, 7))
    );
    r = '0' + Math.round(ca[0] + (cb[0] - ca[0])*alpha).toString(16);
    g = '0' + Math.round(ca[1] + (cb[1] - ca[1])*alpha).toString(16);
    b = '0' + Math.round(ca[2] + (cb[2] - ca[2])*alpha).toString(16);
    return '#'
      + r.substring(r.length - 2)
      + g.substring(g.length - 2)
      + b.substring(b.length - 2);
  }

  function addCorners(e, s, bgColor, fgColor, top) {
    if (s.transparent) addTransparentCorners(e, s, bgColor, top);
    else addAntiAliasCorners(e, s, bgColor, fgColor, top);
  }
  
  function addAntiAliasCorners(e, s, bgColor, fgColor, top) {
    var i, j;
    var d = document.createElement("div");
    d.style.fontSize = '1px';
    d.style.backgroundColor = bgColor;
    var lastarc = 0;
    for (i = 1; i <= s.sizey; i++) {
      var coverage, arc2, arc3;
      // Find intersection of arc with bottom of pixel row
      arc = Math.sqrt(1.0 - Math.pow(1.0 - i / s.sizey, 2)) * s.sizex;
      // Calculate how many pixels are bg, fg and blended.
      var n_bg = s.sizex - Math.ceil(arc);
      var n_fg = Math.floor(lastarc);
      var n_aa = s.sizex - n_bg - n_fg;
      // Create pixel row wrapper
      var x = document.createElement("div");
      var y = d;
      x.style.margin = "0px " + n_bg + "px";
      x.style.height = '1px';
      x.style.overflow = 'hidden';
      // Make a wrapper per anti-aliased pixel (at least one)
      for (j = 1; j <= n_aa; j++) {
        // Calculate coverage per pixel
        // (approximates circle by a line within the pixel)
        if (j == 1) {
          if (j == n_aa) {
            // Single pixel
            coverage = ((arc + lastarc) * .5) - n_fg;
          }
          else {
            // First in a run
            arc2 = Math.sqrt(1.0 - Math.pow(1.0 - (n_bg + 1) / s.sizex, 2)) * s.sizey;
            coverage = (arc2 - (s.sizey - i)) * (arc - n_fg - n_aa + 1) * .5;
          }
        }
        else if (j == n_aa) {
          // Last in a run
          arc2 = Math.sqrt(1.0 - Math.pow((s.sizex - n_bg - j + 1) / s.sizex, 2)) * s.sizey;
          coverage = 1.0 - (1.0 - (arc2 - (s.sizey - i))) * (1.0 - (lastarc - n_fg)) * .5;
        }
        else {
          // Middle of a run
          arc3 = Math.sqrt(1.0 - Math.pow((s.sizex - n_bg - j) / s.sizex, 2)) * s.sizey;
          arc2 = Math.sqrt(1.0 - Math.pow((s.sizex - n_bg - j + 1) / s.sizex, 2)) * s.sizey;
          coverage = ((arc2 + arc3) * .5) - (s.sizey - i);
        }
        
        addCornerDiv(s, x, y, top, alphaBlend(bgColor, fgColor, coverage));
        y = x;
        var x = document.createElement("div");
        x.style.height = '1px';
        x.style.overflow = 'hidden';
        x.style.margin = "0px 1px";
      }
      addCornerDiv(s, x, y, top, fgColor);
      lastarc = arc;
    }
    if (top)
      e.insertBefore(d, e.firstChild);
    else
      e.appendChild(d);
  }
  
  function addCornerDiv(s, x, y, top, color) {
    if (top && !s.tl) x.style.marginLeft = 0;
    if (top && !s.tr) x.style.marginRight = 0;
    if (!top && !s.bl) x.style.marginLeft = 0;
    if (!top && !s.br) x.style.marginRight = 0;
    x.style.backgroundColor = color;
    if (top)
      y.appendChild(x);
    else
      y.insertBefore(x, y.firstChild);
  }

  function addTransparentCorners(e, s, bgColor, top) {
    var d = document.createElement("div");
    d.style.fontSize = '1px';
    var strip = document.createElement('div');
    strip.style.overflow = 'hidden';
    strip.style.height = '1px';
    strip.style.borderStyle = 'solid';
    strip.style.borderColor = bgColor;
    strip.style.borderStyle = 'none solid';
    
    for (var i=0; i < s.sizey; i++) {
      var w = s.sizex - Math.floor(Math.sqrt(1.0 - Math.pow(1.0 - i / s.sizey, 2)) * s.sizex);
      var x = strip.cloneNode(false);
      x.style.borderWidth = '0 '+ w +'px';
      if (top) x.style.borderWidth = '0 '+(s.tr?w:0)+'px 0 '+(s.tl?w:0)+'px';
      else x.style.borderWidth = '0 '+(s.br?w:0)+'px 0 '+(s.bl?w:0)+'px';
      top ? d.appendChild(x) : d.insertBefore(x, d.firstChild);
    } 

    if (top)
      e.insertBefore(d, e.firstChild);
    else
      e.appendChild(d);
  }


}
